<template>
  <div class="todo-header">
    <input
      type="text"
      placeholder="请输入你的任务名称，按回车键确认"
      @keyup.enter="add"
      v-model="title"
    />
  </div>
</template>

<script lang="ts">
import { defineComponent, ref } from "vue";

export default defineComponent({
  name: "Header",
  props: {
    addTodo: {
      type: Function,
      required: true,
    },
  },
  setup(props) {
    const title = ref('');

    //回车的事件回调函数，用来添加数据
    const add = () => {
      //获取文本框中输入的数据，判断不为空
      const text = title.value;
      if(!text.trim()) return;
      //此时有数据，创建一个todo对象
      const todo = {
        id:Date.now(),
        title:text,
        isCompleted:false
      }
      //调用addTodo方法
      props.addTodo(todo);
      //清空文本框
      title.value = '';
    }
    return {
      add,
      title
    }
  }
});
</script>

<style>
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
